388 lines
13 KiB
Dart
388 lines
13 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../models/writing_task.dart';
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import '../providers/writing_provider.dart';
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import 'writing_detail_screen.dart';
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/// 考试写作页面
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class ExamWritingScreen extends ConsumerStatefulWidget {
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final ExamType? examType;
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final String title;
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const ExamWritingScreen({
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super.key,
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this.examType,
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required this.title,
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});
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@override
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ConsumerState<ExamWritingScreen> createState() => _ExamWritingScreenState();
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}
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class _ExamWritingScreenState extends ConsumerState<ExamWritingScreen> {
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ExamType? selectedExamType;
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@override
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void initState() {
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super.initState();
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selectedExamType = widget.examType;
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: const Color(0xFFF5F5F5),
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appBar: AppBar(
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title: Text(widget.title),
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backgroundColor: Colors.white,
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foregroundColor: Colors.black,
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elevation: 0,
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),
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body: Column(
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children: [
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if (widget.examType == null) _buildExamTypeFilter(),
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Expanded(
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child: Builder(
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builder: (context) {
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if (selectedExamType != null) {
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final tasksAsync = ref.watch(examWritingTasksProvider(selectedExamType!));
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return tasksAsync.when(
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data: (tasks) {
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if (tasks.isEmpty) return _buildEmptyState();
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return ListView.builder(
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padding: const EdgeInsets.all(16),
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itemCount: tasks.length,
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itemBuilder: (context, index) {
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final task = tasks[index];
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return _buildTaskCard(task);
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},
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);
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},
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loading: () => const Center(child: CircularProgressIndicator()),
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error: (e, st) => Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(Icons.error_outline, size: 48, color: Colors.grey[400]),
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const SizedBox(height: 12),
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Text('加载失败', style: TextStyle(fontSize: 14, color: Colors.grey[600])),
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const SizedBox(height: 8),
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TextButton(
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onPressed: () {
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ref.invalidate(examWritingTasksProvider(selectedExamType!));
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},
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child: const Text('重试'),
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),
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],
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),
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),
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);
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} else {
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final service = ref.watch(writingServiceProvider);
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return FutureBuilder<List<WritingTask>>(
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future: service.getWritingTasks(limit: 100),
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builder: (context, snapshot) {
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if (snapshot.connectionState == ConnectionState.waiting) {
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return const Center(child: CircularProgressIndicator());
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}
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if (snapshot.hasError) {
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return Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(Icons.error_outline, size: 48, color: Colors.grey[400]),
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const SizedBox(height: 12),
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Text('加载失败', style: TextStyle(fontSize: 14, color: Colors.grey[600])),
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const SizedBox(height: 8),
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TextButton(
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onPressed: () {
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setState(() {});
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},
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child: const Text('重试'),
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),
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],
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),
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);
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}
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final allTasks = snapshot.data ?? [];
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final examTasks = allTasks.where((t) => t.examType != null).toList();
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if (examTasks.isEmpty) return _buildEmptyState();
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return ListView.builder(
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padding: const EdgeInsets.all(16),
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itemCount: examTasks.length,
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itemBuilder: (context, index) {
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final task = examTasks[index];
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return _buildTaskCard(task);
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},
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);
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},
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);
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}
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},
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),
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),
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],
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),
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);
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}
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Widget _buildExamTypeFilter() {
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return Container(
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padding: const EdgeInsets.all(16),
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color: Colors.white,
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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const Text(
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'选择考试类型',
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style: TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 12),
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SingleChildScrollView(
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scrollDirection: Axis.horizontal,
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child: Row(
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children: [
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_buildFilterChip('全部', null),
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const SizedBox(width: 8),
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...ExamType.values.map((type) => Padding(
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padding: const EdgeInsets.only(right: 8),
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child: _buildFilterChip(type.displayName, type),
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)),
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],
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),
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),
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],
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),
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);
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}
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Widget _buildFilterChip(String label, ExamType? type) {
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final isSelected = selectedExamType == type;
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return FilterChip(
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label: Text(label),
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selected: isSelected,
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onSelected: (selected) {
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setState(() {
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selectedExamType = type;
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});
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},
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backgroundColor: Colors.grey[100],
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selectedColor: const Color(0xFF2196F3).withOpacity(0.2),
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checkmarkColor: const Color(0xFF2196F3),
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labelStyle: TextStyle(
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color: isSelected ? const Color(0xFF2196F3) : Colors.grey[700],
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fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
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),
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);
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}
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Widget _buildEmptyState() {
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return Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.school_outlined,
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size: 80,
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color: Colors.grey[400],
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),
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const SizedBox(height: 16),
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Text(
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'暂无考试写作题目',
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style: TextStyle(
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fontSize: 18,
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color: Colors.grey[600],
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fontWeight: FontWeight.w500,
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),
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),
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const SizedBox(height: 8),
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Text(
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'请选择其他考试类型或稍后再试',
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style: TextStyle(
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fontSize: 14,
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color: Colors.grey[500],
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),
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),
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],
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),
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);
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}
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Widget _buildTaskCard(WritingTask task) {
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return Container(
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margin: const EdgeInsets.only(bottom: 16),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(16),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withOpacity(0.05),
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blurRadius: 10,
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offset: const Offset(0, 2),
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),
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],
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),
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child: InkWell(
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onTap: () {
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => WritingDetailScreen(task: task),
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),
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);
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},
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borderRadius: BorderRadius.circular(16),
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child: Padding(
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padding: const EdgeInsets.all(20),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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Expanded(
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child: Text(
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task.title,
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style: const TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.bold,
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),
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),
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),
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Container(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
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decoration: BoxDecoration(
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color: _getExamTypeColor(task.examType!),
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borderRadius: BorderRadius.circular(12),
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),
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child: Text(
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task.examType!.displayName,
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style: const TextStyle(
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fontSize: 12,
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color: Colors.white,
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fontWeight: FontWeight.bold,
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),
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),
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),
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],
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),
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const SizedBox(height: 8),
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Text(
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task.description,
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style: const TextStyle(
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fontSize: 14,
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color: Colors.grey,
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height: 1.4,
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),
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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),
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const SizedBox(height: 12),
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Row(
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children: [
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_buildInfoChip(
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Icons.access_time,
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'${task.timeLimit}分钟',
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const Color(0xFF4CAF50),
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),
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const SizedBox(width: 12),
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_buildInfoChip(
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Icons.text_fields,
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'${task.wordLimit}词',
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const Color(0xFFFF9800),
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),
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const SizedBox(width: 12),
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_buildInfoChip(
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Icons.star,
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'${task.difficulty.level}级',
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_getDifficultyColor(task.difficulty),
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),
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],
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),
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if (task.keywords.isNotEmpty) ...[
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const SizedBox(height: 12),
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Wrap(
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spacing: 6,
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runSpacing: 6,
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children: task.keywords.take(3).map((keyword) => Container(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
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decoration: BoxDecoration(
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color: Colors.grey[100],
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borderRadius: BorderRadius.circular(8),
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),
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child: Text(
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keyword,
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style: const TextStyle(
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fontSize: 12,
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color: Colors.grey,
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),
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),
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)).toList(),
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),
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],
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],
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),
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),
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),
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);
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}
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Widget _buildInfoChip(IconData icon, String text, Color color) {
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return Container(
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padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
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decoration: BoxDecoration(
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color: color.withOpacity(0.1),
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borderRadius: BorderRadius.circular(8),
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),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(
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icon,
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size: 14,
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color: color,
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),
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const SizedBox(width: 4),
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Text(
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text,
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style: TextStyle(
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fontSize: 12,
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color: color,
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fontWeight: FontWeight.w500,
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),
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),
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],
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),
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);
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}
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Color _getDifficultyColor(WritingDifficulty difficulty) {
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switch (difficulty) {
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case WritingDifficulty.beginner:
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return const Color(0xFF4CAF50);
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case WritingDifficulty.elementary:
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return const Color(0xFF8BC34A);
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case WritingDifficulty.intermediate:
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return const Color(0xFFFF9800);
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case WritingDifficulty.upperIntermediate:
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return const Color(0xFFFF5722);
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case WritingDifficulty.advanced:
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return const Color(0xFFF44336);
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}
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}
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Color _getExamTypeColor(ExamType examType) {
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switch (examType) {
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case ExamType.cet:
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return const Color(0xFF2196F3);
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case ExamType.kaoyan:
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return const Color(0xFFF44336);
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case ExamType.toefl:
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return const Color(0xFF4CAF50);
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case ExamType.ielts:
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return const Color(0xFF9C27B0);
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}
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}
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} |